Kim Yo-jong: the sister of Kim Jong-un, fast 'becoming his alter ego'

The North Korean leader’s trusted propagandist-in-chief is in the ascendancy. "She is rumoured to be the brains behind Kim’s carefully constructed public image, at home and abroad. In return, she enjoys the absolute confidence of her brother, a leader capable of ordering the execution of his own uncle for alleged treason." Justin McCurry investigates in the Guardian.